Youre not being very clear.
Aer you asking how to buy it using paypal? or just in general?
Plenty of exchanges you can work with if youre planning on using your own fiat to buy it. If its paypal you plan to use then youll need to get more creative.
Look in the service sellers section as well - at least 4 different services offered there,
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AGED SUPER HIGH LIMIT ACCOUNTS: 10,000/$1,000,000 and 25,000/$500,000